More about track etching statistics

Statistical errors of the track etching method were investigated by using the LR-115 nuclear track detector and visual microscopic counting. In the experiment, four persons counted tracks of the same detector and the analysis of variance was applied to the respective means and standard deviations. Another experiment was performed with ten detectors exposed to air in the same room; after standard etching and counting, the relative error of the detector track density was obtained as 11.2%. Taking into account the errors of the detector sensitivity coefficient and background, the total relative error of the track etching method was 19.5% in case of measurements of the indoor radon concentration of 8.2 Bq m-3. (author) 4 refs.; 2 tabs